#define  _CRT_SECURE_NO_WARNINGS 1

#include "STack.h"


void STInit(ST* ps)
{
	assert(ps);

	STDataType* tmp= (STDataType*)malloc(sizeof(STDataType) * 4);
	if (tmp == NULL)
	{
		perror("Init malloc fail");
		exit(-1);
	}

	ps->a = tmp;
	ps->capacity = 4;
	ps->top = 0;
}

void STDestroy(ST* ps)
{
	assert(ps);
	free(ps->a);
	ps->a == NULL;
	ps->top = ps->capacity = 0;
}

void STPush(ST* ps, STDataType x)
{
	assert(ps);

	if (ps->capacity == ps->top)
	{
		STDataType* tmp = realloc(ps->a, ps->capacity * 2 * sizeof(STDataType));
		if (tmp == NULL)
		{
			perror("Push realloc fail");
			exit(-2);
		}
		ps->a = tmp;
		ps->capacity *= 2;

	}

	ps->a[ps->top] = x;
	ps->top++;
}
void STPop(ST* ps)
{
	assert(ps);
	assert(ps->top > 0);

	ps->top--;
}
STDataType STTop(ST* ps)
{
	assert(ps);
	assert(ps->top > 0);

	return ps->a[ps->top - 1];
}

int STSize(ST* ps)
{
	assert(ps);

	return ps->top;
}
bool STEmpty(ST* ps)
{
	assert(ps);

	return ps->top == 0;
}

